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Debt - Senior Secured Convertible Notes due 2027 (Details)
 3 Months Ended 9 Months Ended
Nov. 17, 2020
USD ($)
component
$ / shares
shares
Sep. 30, 2024
USD ($)
$ / shares
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
$ / shares
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
$ / shares
Dec. 31, 2021
USD ($)
Line of Credit Facility              
Principal balance   $ 1,061,400,000   $ 1,061,400,000   $ 1,130,600,000  
Common stock, par value (in dollars per share) | $ / shares   $ 0.01   $ 0.01   $ 0.01  
2027 Notes | Convertible Debt              
Line of Credit Facility              
Principal balance $ 497,100,000 $ 485,300,000   $ 485,300,000   $ 485,300,000  
Stated interest rate (as a percent) 6.00%            
Common stock, par value (in dollars per share) | $ / shares $ 0.01            
Percentage of notes initially convertible to common stock 42.00%           41.00%
Repurchased face amount             $ 11,800,000
Minimum qualified cash required $ 30,000,000.0            
Number of components | component 2            
Fair value of equity component of debt   279,600,000   279,600,000   279,600,000  
Interest expense   7,300,000 $ 7,300,000 21,800,000 $ 21,800,000    
Interest paid       14,600,000 14,600,000    
Amortization of the discount   3,800,000 3,400,000 11,000,000 9,900,000    
Amortization of debt issuance costs   $ 0 $ 0 $ 0 $ 0    
Effective interest rate (as a percent)   10.50%   10.50%      
2027 Notes | Convertible Debt | Fair Value, Inputs, Level 2              
Line of Credit Facility              
Debt fair value   $ 595,300,000   $ 595,300,000   $ 395,600,000  
2027 Notes | Convertible Debt | Period 1              
Line of Credit Facility              
Redemption rate 110.00%            
Maximum repurchase amount $ 100,000,000            
Repurchase period after debt maturity 91 days            
Total gross leverage ratio 1.5            
2027 Notes | Convertible Debt | Period 2              
Line of Credit Facility              
Redemption rate 130.00%            
Maximum repurchase amount $ 99,400,000            
Redemption term (in years) 4 years            
2027 Notes | Convertible Debt | Scenario, Plan              
Line of Credit Facility              
Initial conversion rate (in shares) | shares 200            
Conversion price (in dollars per share) | $ / shares $ 5.00